Beyonce’s bodyguard, Julius De Boer, became instantly famous when — on surveillance video captured in a hotel elevator after the Met Gala — he saved her husband,Jay Z, from a brutal attack at the hands of her sister, Solange Knowles. On the video, Julius comes across as professional, loyal and level headed. But while all that may be true, Star has learned that there’s a lot more to the bodyguard — and his relationship with Beyonce — than meets the eye.

“Jay definitely thinks that there was and may still be something romantic going on between Bey and Julius,” an insider tells Star of the hip-hop mogul, whose own rumored cheating was the reported cause of Solange’s attack. “He wanted to fire Julius last February, but Beyonce said, ‘Julius isn’t going anywhere.'”

The “XO” singer and her bodyguard have raised eyebrows for years for their unusually close relationship. In 2009, they were spotted leaving a hotel, his lips stained with the signature’s signature red lipstick. Despite being subject to numerous cheating rumors himself, Jay is, nonetheless, “very jealous” of his wife’s friendship with Julius — and friends believe he may have a reason to be.

“They’ve spent a lot of time together behind closed doors,” the source explains. “He’s even stayed in her hotel room.”

Julius isn’t the only man to come between the power couple either. Pick up the latest issue of Star, on newsstands now, for all the scoop on Beyonce’s wandering eye!